If it's really as you described, when draining at the same time filling up, then it's a problem in the main control board. You'll need some electronics knowledge to repair it, or just replace the main board

Check the lid cover. At the edge, there is a plastic housing some sort of a magnet. This is the magnetic sensor for lid cover open protection.
If the magnet is not there, place a magnet at the position on the washer where the housing will come in contact with the washer when lid is close.

Hi,
No you just need to get the drain hose up higher...the water is siphoning out and is either caused by the end of the drain hose still in water and not having an air gap or the hose is not going up higher then the top of your washer...
Lifting the hose up should give you an air gap and get the hose high enough to stop the siphoning...

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Sounds like it's stuck in rinse, try unplugging it for 5 mins then power up turn the selector to normal cycle and start, see what happens. There might be a reset cycle it has to do. Or a programming mode. LG 18002430000 customer service

Hi,
No you just need to get the drain hose up higher...the water is siphoning out and is either caused by the end of the drain hose still in water and not having an air gap or the hose is not going up higher then the top of your washer...
Lifting the hose up should give you an air gap and get the hose high enough to stop the siphoning...